/Engine/Source/Runtime/Engine/Classes/Engine/World.h
Remove multiple streaming levels to the list of streamed levels to consider. Returns a count of how many of the specified levels were in the streaming levels list
int32 RemoveStreamingLevels ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) *const > StreamingLevelsToRemove )